US6339797B1 - Input/output client server system for transmitting commands to general purpose input/output by using IP address, interface address, and physical port address - Google Patents
Input/output client server system for transmitting commands to general purpose input/output by using IP address, interface address, and physical port addressDownload PDFInfo
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- US6339797B1 US6339797B1US09/221,813US22181398AUS6339797B1US 6339797 B1US6339797 B1US 6339797B1US 22181398 AUS22181398 AUS 22181398AUS 6339797 B1US6339797 B1US 6339797B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
- H04L67/125—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks involving control of end-device applications over a network
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/34—Network arrangements or protocols for supporting network services or applications involving the movement of software or configuration parameters
Definitions
- the inventionrelates to an input/output client/server system, in which a general purpose apparatus provided with a function to communicate across networks complying with the TCP/IP protocol, such as a personal computer with Windows NTTM or Windows 95TM installed therein, can control, via the networks, general purpose input/output devices connected to a general purpose apparatus on the other end.
- a general purpose apparatusprovided with a function to communicate across networks complying with the TCP/IP protocol, such as a personal computer with Windows NTTM or Windows 95TM installed therein, can control, via the networks, general purpose input/output devices connected to a general purpose apparatus on the other end.
- the general purpose apparatus executing the application softwarewill be called the client side and the general purpose apparatus having input/output devices connected thereto will be called the server side.
- An object of the inventionis to provide an input/output client/server system in which the server side software need not be developed and changed to operate the input/output devices, and where the input/output devices on the server side can be controlled only by developing and changing software on the client side.
- an input/output client/server system in a remote control system between general purpose apparatuses provided with communications functions across networks complying with the TCP/IP protocolcomprising single or plural general purpose input/output units mounted on the interface boards of remote input/output devices of a general purpose apparatus on the receiver side and provided with a function to give a predetermined response to a command transmitted thereto from a general purpose apparatus on the transmitter side, means for recognizing addresses of the general purpose input/output units provided on the receiver side, and means for transmitting a command to the general purpose input/output unit with, attached thereto, the IP address of the general purpose apparatus at the destination and the port address of the general purpose input/output unit connected to the general purpose apparatus provided on transmitter side.
- the networkmay be set up with a local area network or the Internet.
- the power source of the general purpose apparatus on the receiver side and the power sources of the general purpose input/output unitsmay be kept independent of one another, and the signal lines between the general purpose apparatus on the receiver side and the general purpose input/output units may be formed of floating-ground floating lines.
- FIG. 1is a block diagram showing the configuration of an embodiment of the invention.
- FIG. 2is a block diagram showing the state of connections between input-output units in the embodiment of the invention.
- the inventionprovides an input/output client/server system using a technology to achieve access, in a network environment complying with the TCP/IP protocol, from a general purpose apparatus in the network to a port, a physical port, of general purpose input/output units connected to another general purpose apparatus in the network by means of an IP address as an address element for designating an input/output port when making input/output access across the network, as well as an application software developing environment in which the aforesaid system is used.
- the inventionalso provides a system, in which development of software is only required for the application side, enabling a general purpose apparatus to access a port of general purpose input/output devices connected to another general purpose apparatus anywhere in the world through the Internet by designating its IP address.
- FIG. 1is a block diagram showing the configuration of an input/output client/server system of the invention.
- reference numeral 10denotes a personal computer on the client side
- 20denotes a personal computer on the server side
- 30denotes an Ethernet cable
- 40denotes sets of input/output units mounted in slots on the interface boards of the personal computer 20 on the server side
- 50denotes a remote PC (personal computer) connected to the system through the Internet.
- each of the input/output units 40 - 0 - 40 - 3there are provided, as shown in FIG. 2, an interface board I/F, slots 0 - F, and a power source 60 which is independent of the personal computer.
- slots 0 - Fthere are inserted single-function input/output devices 70 such as a motor 70 - 1 , a display 70 - 2 , an alarm lamp 0 - 3 , and a switch 70 - 4 , in connection thereto.
- a portion of an input-output interface # 3is set up as a virtual port independent of the personal computer port. This eliminates the need for compatibility with the hardware of the personal computer 20 .
- designation of the input-output interface # 3is made by designating the unit, slot, and port.
- the port address for accessing port 2 of interface # 1is composed of unit l(interface # 1 ), slot 1 (interface of input output unit 40 - 1 ), and port 2 and, hence, it becomes 112 h.
- the input-output units connected theretoare registered in an OS such as Windows NT or Windows 95. This operation is performed by inserting the FD with the procedure for registration written therein in the FD drive unit and executing the setup program.
- the driver software in the above OSupon receipt of an external request for accessing an input-output unit, only transmits the request to the designated inputoutput unit and makes a response to the request, while not accessing the input/output device within the personal computer. Therefore, the personal computer is safe in terms of its software.
- the client sidein designating a port address through the software incorporated in the PC 10 , can access any general purpose input/output device 70 of a general purpose apparatus in the network by designating the IP address and the port address. Namely, it transmits the following signals over the Ethernet or Internet.
- the commandis an instruction given to the input/output device 70 .
- the motor 70 - 1When outputting to the motor 70 - 1 , its content is direction and quantity of movement, whereas when inputting therefrom, its content is a request for data of the current position.
- the display 70 - 2When outputting to the display 70 - 2 , it is a request for output data on the display, and when outputting to the alarm lamp 70 - 3 , it is an instruction to turn on and off the lamp according to information in the output data.
- the switch 70 - 4When inputting from the switch 70 - 4 , it is a request for supply of on/off information concerning the switch.
- the input-output server 20is constituted of the software and hardware incorporated in the general purpose apparatus and upon receipt of an input request from a client PC 10 designating the IP address thereof, it executes access to the general purpose device 70 and sends back the results to the client PC 10 .
- the client side PC 10provides an access program for inputting/outputting in the OCX format of the WindowsTM.
- the server side personal computer PC 20operates as a Windows service.
- the term “Windows-socket” m 0 eans a two-way inter-process communications method using the TCP/IP protocol system and the “socket” means a terminal point in the network connection.
- Two processesuse the sockets ( ) and establish a network path between themselves by connecting the sockets produced by each.
- each of the units 40 - 0 - 40 -Fis provided with an independent power source 60 as shown in FIG. 2, the personal computer is capable of accessing access from its interface board # 1 , through the floating line # 2 , to the interfaces # 3 of the input-output interface units, to thereby control a plurality of units # 4 as electrically independent of one another.
- the floating line # 2is formed of a floating TTL circuit (IC) and the like, and provided with a floating ground, the input-output unit and the personal computer are kept electrically independent of each other. Therefore, even if power of the input-output unit is cut off or an electrical fault is produced in the input-output unit while power is applied to the personal computer, no adverse effect is produced on the personal computer or other input-output units. This is an essential factor for the invention employing general purpose devices.
- development of application software for realizing access to input/output devices across networks by utilizing the input/output client/server systemcan be attained on the client side by only designating the IP address and the port address for invoking the desired software.
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Abstract
Description
The invention relates to an input/output client/server system, in which a general purpose apparatus provided with a function to communicate across networks complying with the TCP/IP protocol, such as a personal computer with Windows NTTM or Windows 95TM installed therein, can control, via the networks, general purpose input/output devices connected to a general purpose apparatus on the other end.
With the aim of enhancing productivity in a factory, for example, there have so far been architectured systems capable of exercising such management and control functions for machinery and equipment in the production line for the surveillance of operating conditions, collection of data concerning production results, analysis of output, and for controlling the machinery and equipment on each unit thereof. As an example, it is common to use a LAN (Local Area Network) in the production field by connecting microcomputers for controlling machines (for controlling input/output devices) to general purpose personal computers for production control.
In order to develop application software which enables access across the networks to input/output devices by use of general purpose personal computers, it was necessary to follow the procedure below in addition to making communications with microcomputers (for controlling input/output devices):
1. to develop client side software for transmitting input/output requests from the application software to the server side;
2. to develop server side software for receiving requests from the client side;
3. to develop server side software for accessing input/output devices;
4. to develop server side software for transmitting results of the access to the input/output devices to the client side; and
5. to develop client side software for receiving requests from the server side.
Incidentally, herein, the general purpose apparatus executing the application software will be called the client side and the general purpose apparatus having input/output devices connected thereto will be called the server side.
In the prior arts, it was possible to access input/output devices across networks by developing the above five sets of software. However, since these sets of software were dedicated, it was necessary to develop new software when there was a plurality of server sides.
Further, when there was a plurality of client sides, it was necessary for the server side to develop software capable of exclusive processing.
Furthermore, when a partial specification was changed, review or adjustment of the five sets of software became necessary, and this led to on increase in software development time and maintenance work and, above all, it increased costs.
An object of the invention is to provide an input/output client/server system in which the server side software need not be developed and changed to operate the input/output devices, and where the input/output devices on the server side can be controlled only by developing and changing software on the client side.
In order to solve this problem, there is provided an input/output client/server system in a remote control system between general purpose apparatuses provided with communications functions across networks complying with the TCP/IP protocol, comprising single or plural general purpose input/output units mounted on the interface boards of remote input/output devices of a general purpose apparatus on the receiver side and provided with a function to give a predetermined response to a command transmitted thereto from a general purpose apparatus on the transmitter side, means for recognizing addresses of the general purpose input/output units provided on the receiver side, and means for transmitting a command to the general purpose input/output unit with, attached thereto, the IP address of the general purpose apparatus at the destination and the port address of the general purpose input/output unit connected to the general purpose apparatus provided on transmitter side.
The network may be set up with a local area network or the Internet.
The power source of the general purpose apparatus on the receiver side and the power sources of the general purpose input/output units may be kept independent of one another, and the signal lines between the general purpose apparatus on the receiver side and the general purpose input/output units may be formed of floating-ground floating lines.
FIG. 1 is a block diagram showing the configuration of an embodiment of the invention.
FIG. 2 is a block diagram showing the state of connections between input-output units in the embodiment of the invention.
The invention provides an input/output client/server system using a technology to achieve access, in a network environment complying with the TCP/IP protocol, from a general purpose apparatus in the network to a port, a physical port, of general purpose input/output units connected to another general purpose apparatus in the network by means of an IP address as an address element for designating an input/output port when making input/output access across the network, as well as an application software developing environment in which the aforesaid system is used. The invention also provides a system, in which development of software is only required for the application side, enabling a general purpose apparatus to access a port of general purpose input/output devices connected to another general purpose apparatus anywhere in the world through the Internet by designating its IP address.
An embodiment of the invention will be concretely described with reference to the accompanying drawings.
FIG. 1 is a block diagram showing the configuration of an input/output client/server system of the invention.
Referring to FIG. 1,reference numeral 10 denotes a personal computer on the client side,20 denotes a personal computer on the server side,30 denotes an Ethernet cable,40 denotes sets of input/output units mounted in slots on the interface boards of thepersonal computer 20 on the server side, and50 denotes a remote PC (personal computer) connected to the system through the Internet.
In each of the input/output units40-0 -40-3,..., there are provided, as shown in FIG. 2, an interface board I/F, slots0 - F, and apower source 60 which is independent of the personal computer. In slots0 - F, there are inserted single-function input/output devices70 such as a motor70-1, a display70-2, an alarm lamp0-3, and a switch70-4, in connection thereto.
In the present embodiment, a portion of an input-output interface # 3 is set up as a virtual port independent of the personal computer port. This eliminates the need for compatibility with the hardware of thepersonal computer 20.
In this virtual port, designation of the input-output interface # 3 is made by designating the unit, slot, and port.
In the configuration shown in FIG. 2, the port address for accessingport 2 ofinterface # 1 is composed of unit l(interface #1), slot1(interface of input output unit40-1), andport 2 and, hence, it becomes112h.
Likewise, when accessinginterface # 1, port8 of interface of input output unit40-2, the port address becomes128h. Thus, any of the ports000 - FFF can be accessed.
The procedure for constructing the input/output client/server system of the invention will be described below.
First, in thepersonal computer 20 on the server side, the input-output units connected thereto are registered in an OS such as Windows NT or Windows 95. This operation is performed by inserting the FD with the procedure for registration written therein in the FD drive unit and executing the setup program. The driver software in the above OS, upon receipt of an external request for accessing an input-output unit, only transmits the request to the designated inputoutput unit and makes a response to the request, while not accessing the input/output device within the personal computer. Therefore, the personal computer is safe in terms of its software.
The client side, in designating a port address through the software incorporated in the PC10, can access any general purpose input/output device70 of a general purpose apparatus in the network by designating the IP address and the port address. Namely, it transmits the following signals over the Ethernet or Internet.
For inputting - IP address, command, unit number, and slot number.
For outputting - IP address, command, unit number, slot number, and output data.
Here, the command is an instruction given to the input/output device70. When outputting to the motor70-1, its content is direction and quantity of movement, whereas when inputting therefrom, its content is a request for data of the current position. When outputting to the display70-2, it is a request for output data on the display, and when outputting to the alarm lamp70-3, it is an instruction to turn on and off the lamp according to information in the output data. When inputting from the switch70-4, it is a request for supply of on/off information concerning the switch.
The input-output server 20 is constituted of the software and hardware incorporated in the general purpose apparatus and upon receipt of an input request from a client PC10 designating the IP address thereof, it executes access to the general purpose device70 and sends back the results to the client PC10.
The client side PC10 provides an access program for inputting/outputting in the OCX format of the WindowsTM.
The server side personal computer PC20 operates as a Windows service.
Communications over the network are carried out by using the technology of the Windows-socket.
Here, the term “Windows-socket” m0eans a two-way inter-process communications method using the TCP/IP protocol system and the “socket” means a terminal point in the network connection. Two processes use the sockets ( ) and establish a network path between themselves by connecting the sockets produced by each.
While each of the units40-0 -40-F is provided with anindependent power source 60 as shown in FIG. 2, the personal computer is capable of accessing access from itsinterface board # 1, through thefloating line # 2, to theinterfaces # 3 of the input-output interface units, to thereby control a plurality ofunits # 4 as electrically independent of one another.
Thus, loss of the power source of an input/output interface unit, or electrical trouble occurring therein, do not affect other input-output interface units or the personal computer.
Since thefloating line # 2 is formed of a floating TTL circuit (IC) and the like, and provided with a floating ground, the input-output unit and the personal computer are kept electrically independent of each other. Therefore, even if power of the input-output unit is cut off or an electrical fault is produced in the input-output unit while power is applied to the personal computer, no adverse effect is produced on the personal computer or other input-output units. This is an essential factor for the invention employing general purpose devices.
According to the invention, development of application software for realizing access to input/output devices across networks by utilizing the input/output client/server system can be attained on the client side by only designating the IP address and the port address for invoking the desired software.
Therefore, even when there are a plurality of server sides, only the client side is required to designate the IP address. Further, a plurality of client sides can make access from their application to one server side. Further, when specifications are changed, they can be adopted by simply changing the application software on the client side.
In this way, the efficiency in software development can be greatly enhanced.
Claims (4)
1. An input/output client/server system in a remote control system between general purpose apparatuses provided with communications functions across networks complying with TCP/IP protocol comprising:
at least one general purpose apparatus;
at least one interface;
at least one general purpose input/output unit mounted on the at least one interface board and provided with a function to give a predetermined response to a command transmitted thereto from the at least one general purpose apparatus on a transmitter side;
said at least one interface recognizing addresses of said general purpose input/output units provided on said general purpose apparatus on the receiver side; and
means for transmitting a command to said general purpose input/output unit by using an IP address of the general purpose apparatus at the destination, an address of said at least one interface and a physical port address of the general purpose input/output unit connected to said general purpose apparatus on the transmitter side.
2. An input/output client/server system according toclaim 1 , wherein said network is a Local Area Network (LAN).
3. An input/output client/server system according toclaim 1 , wherein said network is an Internet.
4. An input/output client/server system according toclaim 1 , wherein a power source of said general purpose apparatus on the receiver side and a power source of said at least one general purpose input/output unit are independent of one another, and wherein signal lines between said general purpose apparatus on the receiver side and said general purpose input/output units are formed of floating-ground floating lines.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19293597AJP3203206B2 (en) | 1997-07-17 | 1997-07-17 | Input/Output Client Server System |
| US09/221,813US6339797B1 (en) | 1997-07-17 | 1998-12-29 | Input/output client server system for transmitting commands to general purpose input/output by using IP address, interface address, and physical port address |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19293597AJP3203206B2 (en) | 1997-07-17 | 1997-07-17 | Input/Output Client Server System |
| US09/221,813US6339797B1 (en) | 1997-07-17 | 1998-12-29 | Input/output client server system for transmitting commands to general purpose input/output by using IP address, interface address, and physical port address |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US6339797B1true US6339797B1 (en) | 2002-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US09/221,813Expired - Fee RelatedUS6339797B1 (en) | 1997-07-17 | 1998-12-29 | Input/output client server system for transmitting commands to general purpose input/output by using IP address, interface address, and physical port address |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US6339797B1 (en) |
| JP (1) | JP3203206B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8549093B2 (en) | 2008-09-23 | 2013-10-01 | Strategic Technology Partners, LLC | Updating a user session in a mach-derived system environment |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5522042A (en) | 1994-01-28 | 1996-05-28 | Cabletron Systems, Inc. | Distributed chassis agent for distributed network management |
- 1997
- 1997-07-17JPJP19293597Apatent/JP3203206B2/ennot_activeExpired - Lifetime
- 1998
- 1998-12-29USUS09/221,813patent/US6339797B1/ennot_activeExpired - Fee Related
Patent Citations (4)
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|---|---|---|---|---|
| US5325491A (en)* | 1993-04-13 | 1994-06-28 | International Business Machines Corporation | Method and apparatus for extending a computer bus |
| US6123241A (en)* | 1995-05-23 | 2000-09-26 | Applied Tool Development Corporation | Internal combustion powered tool |
| US5872998A (en)* | 1995-11-21 | 1999-02-16 | Seiko Epson Corporation | System using a primary bridge to recapture shared portion of a peripheral memory of a peripheral device to provide plug and play capability |
| US6157950A (en)* | 1997-12-05 | 2000-12-05 | Encanto Networks, Inc. | Methods and apparatus for interfacing a computer or small network to a wide area network such as the internet |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8549093B2 (en) | 2008-09-23 | 2013-10-01 | Strategic Technology Partners, LLC | Updating a user session in a mach-derived system environment |
| US8924502B2 (en) | 2008-09-23 | 2014-12-30 | Strategic Technology Partners Llc | System, method and computer program product for updating a user session in a mach-derived system environment |
| USRE46386E1 (en) | 2008-09-23 | 2017-05-02 | Strategic Technology Partners Llc | Updating a user session in a mach-derived computer system environment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1139248A (en) | 1999-02-12 |
| JP3203206B2 (en) | 2001-08-27 |
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